The Khan Academy is a nonprofit organization where you can watch over 3000 educational videos for free. Topics include K-12 math, biology, chemistry, physics, finances, history, and more. They also have practice exercises and assessments.
The videos are short, especially made for internet viewing. In the math videos, you are looking at a blackboard. The instructor writes out the problem while talking you through it. In the other subject areas, there are often pictures accompanying the lesson. The videos have a comment section at the end for viewers to ask questions.
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